In second language (L2) listening and speaking pedagogy, oral communication serves diverse socio-linguistic and functional needs. Consider the following four advanced propositions regarding the functions of language in spoken discourse: I. Transactional language focuses primarily on the exchange of goods, services, and propositional information where the successful transfer of referential data and task completion are paramount, with interpersonal rapport playing a secondary role (e.g., purchasing a ticket or negotiating a contract). II. Interactional language is primarily listener-oriented and socio-affective, functioning to establish and maintain social relationships, foster solidarity, and manage interpersonal bonding through casual greetings, small talk, and banter, where message accuracy is subordinate to social harmony. III. Talk as performance refers to public speaking events that transmit information before an audience in a structured, predictable format akin to written texts (e.g., academic lectures, public announcements, and formal debates), requiring careful attention to form, audience appropriateness, and stylistic register. IV. In spoken discourse analysis, monologue and dialogue differ exclusively in turn-taking mechanics, yet both genres uniformly require identical micro-skills such as script recognition, negotiation of meaning, and real-time ellipsis resolution, rendering sociolinguistic context irrelevant to spoken language production. Identify the option that correctly evaluates the linguistic, functional, and pedagogical validity of propositions I, II, III, and IV according to standard English language teaching methodology and Functions of language principles.